Fix clean task Error: ENOTEMPTY: directory not empty, rmdir

[colinrotherham]

Description

This PR is a workaround to an issue with Node.js fsPromises.rm() where deleting large directories such as packages/nhsuk-frontend/dist throws ENOTEMPTY or other errors when the file system is busy

[Error: ENOTEMPTY: directory not empty, rmdir '/path/to/nhsuk-frontend/packages/nhsuk-frontend/dist'] {
  errno: -66,
  code: 'ENOTEMPTY',
  syscall: 'rmdir',
  path: '/path/to/nhsuk-frontend/packages/nhsuk-frontend/dist'
}

Checklist

• Tested against our testing policy (Resolution, Browser & Accessibility)
• Follows our coding standards and style guide
• CHANGELOG entry

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[colinrotherham]

The del package doesn't set maxRetries when removing files or directories

But updating the glob dist → dist/nhsuk/* splits out multiple paths to delete which appears to solve the problem (i.e. smaller batched deletes rather than one large delete)

[colinrotherham]

This change fixes an issue where switching branches would leave empty directories behind, which then causes errors when trying to run file operations or build tasks on them

E.g. packages/nhsuk-frontend/src/nhsuk/components/search-input